/*
 *   Copyright 2008 Francois Fernandes
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */
package com.googlecode.jobjectlife.internal;

public class Assert
{
    public static void notNull( String parameterName, Object value )
    {
        if ( value == null )
        {
            throw new IllegalArgumentException( parameterName + " may not be null" );
        }
    }

    public static void isInterface( String parameterName, Class<?> clazz )
    {
        if ( !clazz.isInterface() )
        {
            throw new IllegalArgumentException( parameterName + " has to be an interface" );
        }
    }

    public static void isConcreteClass( String parameterName, Class<?> clazz )
    {
        if ( clazz.isInterface() )
        {
            throw new IllegalArgumentException( parameterName + " has to be a non abstract class." );
        }
    }

    public static void isDerived( String parameterName, Class<?> superC, Class<?> derivedC )
    {
        if ( !superC.isAssignableFrom( derivedC ) )
        {
            throw new IllegalArgumentException( parameterName + " has to be a subclass of " + superC.getName() );
        }
    }
}
